Higher Systems

Which of these is TRUE about cache memory?

• Directly addressable by programs
• Larger capacity than RAM
• Made of dynamic RAM
• Physically closer to processor

Which law protects people from a DOS attack?

• Computer Misuse Act
• Data Protection Act
• Regulation of Investigatory Powers Act
• Copyright Design & Patents Act

How are bitmapped graphics stored on a computer?

• An array of pixels, each with a bit depth
• Objects and their associated attributes

Which security precaution ensures data can be transmitted safely across a network?

• Passwords
• Biometrics
• Digital Certificates
• Encryption

Adam searches the Internet for a new smartphone. Now when he views other web sites, he frequently sees adverts for smartphones. Explain the technology that allows this to happen.

• Encryption
• Tracking cookies
• Digital certificate
• Keylogging

State which of the following denary numbers is represented as 10010111 using two's complement.

• -105

• 151

• -151

• 105

State which of the following 8-bit two's complement numbers represent the denary number -100.

• 10011100

• 00011100

• 01100100

• 11100100

State which statement describes the effect of changing the number of bits assigned to the mantissa.

• Increase the number of bits: Precision increases

  Decrease the number of bits: Precision decreases

• Increase the number of bits: Precision decreases

  Decrease the number of bits: Precision increases

• Increase the number of bits: Range increases

  Decrease the number of bits: Range decreases

• Increase the number of bits: Range decreases

  Decrease the number of bits: Range increases

State which of the following are advantages of using Unicode compared to ASCII.

• Unicode can represent more characters as it uses 16 bits compared to 8 bits.

• Unicode can represent many languages allowing for one standard method of communication.

• Unicode has a larger file size as it uses 16 bits compared to ASCII which only used 8 bits.

• ASCII is commonly used across the world to represent multiple languages.

Describe the term "cache memory".

• Cache memory stores frequently executed instructions. Cache memory can be accessed quickly but its capacity is smaller than RAM.

• Cache memory stores a cache of common answers to questions that the user searches using a search engine.

• Cache memory is used to store website that people commonly use that that they can be loaded faster.

• Cache memory is a type of memory that is accessed after RAM but before the backing storage so that commonly used instructions can be accessed faster.